From my notebook, I accidently deleted the text AND saved it. Is it possible
to retrieve the old text?
If the document is still open, you can click Undo until the document
returns to the previous state. Once you close the document, though,
that's no longer possible.
If you have the "Always create backup" box checked in the Tools >
Options > Save dialog, you would find a file in the same folder, named
like "Backup of XYZ.wbk". This would be a copy of the document as it
was just before the most recent Save. See
http://www.gmayor.com/automatically_backup.htm.
You might have a backup if you did regular backups of all changed
files on your disk, but if you had that you'd know about it, and you
wouldn't be asking here. :-(
Among other remote possibilities, do you have a printed copy of the
document that you could scan and OCR? Do you have File > Versions
turned on?
Otherwise, it's very unlikely that you'll be able to recover anything
useful.
